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Biochemistry
General Knowledge > General Science
BIOCHEMISTRY MCQs
Total Questions : 44 | Page
4
of 5 pages
Question 31.
A base is a substance that
does not release any ions when dissolved in water
releases Hydrogen ions when dissolved in water
releases Hydroxide ions when dissolved in water
All of above
See Solution
Discuss Question
Answer: Option C. ->
releases Hydroxide ions when dissolved in water
Question 32.
Water molecules are
cohesive
adhesive
nonpolar
fatty
See Solution
Discuss Question
Answer: Option C. ->
nonpolar
Question 33.
Butter is an example of a
carbohydrate
unsaturated fat
saturated fat
protein
See Solution
Discuss Question
Answer: Option C. ->
saturated fat
Question 34.
What is the purpose of an enzyme?
block an unwanted chemical reaction
create activation energy
cause or speed up a chemical reaction
permanently bond with a substrate
See Solution
Discuss Question
Answer: Option C. ->
cause or speed up a chemical reaction
Question 35.
Where do substrates bind on an enzyme?
voltage-gated channels
surface receptor
calcium channels
active site
See Solution
Discuss Question
Answer: Option D. ->
active site
Question 36.
Made of glycerol and fatty acids
Carbohydrates
Lipids
Proteins
Nucleic Acids
See Solution
Discuss Question
Answer: Option B. ->
Lipids
Question 37.
The energy needed to start a reaction
activation energy
adhesion energy
chemical energy
cohesion energy
See Solution
Discuss Question
Answer: Option A. ->
activation energy
Question 38.
Which of the following statements about enzymes is NOT true?
enzymes are reusable
enzymes work best at specific pH and temperatures
enzymes are lipids
enzymes are proteins
See Solution
Discuss Question
Answer: Option C. ->
enzymes are lipids
Question 39.
Why does ice float?
As water freezes, it expands and its density decreases.
As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
See Solution
Discuss Question
Answer: Option A. ->
As water freezes, it expands and its density decreases.
Question 40.
How do enzymes speed up a reaction?
increase the activation energy
lower the activation energy
they add heat to the reaction
they decrease how many reactions can take place
See Solution
Discuss Question
Answer: Option B. ->
lower the activation energy
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